Title:
POLYPROPYLENE SHEET PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/075755
Kind Code:
A1
Abstract:
Disclosed is a method for producing a polypropylene sheet having a thickness of 0.5-5 mm, the method comprising: step 1 for preparing a precursor which has alternately laminated therein a first biaxially-drawn polypropylene film having a thickness of less than 0.15 mm and a melting point of Tmh and a second biaxially-drawn polypropylene film having a thickness of less than 0.15 mm and a melting point of Tml; and step 2 for heating and fusing the interlayer space between the films by bringing a heating element into contact with an outermost layer of the precursor, wherein Tmh-Tml≥8 (°C) is satisfied (these melting points are obtained by taking measurements using DSC at a temperature increase rate of 10°C/min from 30°C to 230°C).
Inventors:
NAKAJIMA TAKESHI (JP)
IKEDA MASAYUKI (JP)
KATAGIRI AKIHIRO (JP)
IKEDA MASAYUKI (JP)
KATAGIRI AKIHIRO (JP)
Application Number:
PCT/JP2019/039822
Publication Date:
April 16, 2020
Filing Date:
October 09, 2019
Export Citation:
Assignee:
SUNALLOMER LTD (JP)
International Classes:
B29C65/18; B29C48/16; B29C55/12; B32B27/32
Foreign References:
| JP2017186561A | 2017-10-12 | |||
| JPH05254026A | 1993-10-05 | |||
| JPH04173126A | 1992-06-19 | |||
| JP2001139712A | 2001-05-22 | |||
| JPS55154131A | 1980-12-01 | |||
| JP2002301772A | 2002-10-15 | |||
| JP2012096526A | 2012-05-24 | |||
| JP2017186561A | 2017-10-12 | |||
| JP2011500907A | 2011-01-06 | |||
| US4399054A | 1983-08-16 | |||
| EP0674991B1 | 1999-02-17 |
Other References:
M. KAKUGOY. NAITOK. MIZUNUMAT. MIYTAKE, MACROMOLECULES, vol. 15, 1982, pages 1150 - 1152
See also references of EP 3865285A4
See also references of EP 3865285A4
Attorney, Agent or Firm:
ONO, Shinjiro et al. (JP)
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